You need ruby gems in your weapons for the extra atk damage. You only get dex from emeralds in armor items, excluding the helm. Also for dual wielding, your dps suffers is one is far greater than the other. You need both weapons to be within the same ballpark as one another two 50 dps weapons are better than a 60 and 40 even if you are thinking they both add up to 100.

Related question: my dps is pretty low for a level 32 monk, partly because I have a decent vitality score and an unintentionally good intelligence score. I just picked up a rare socketed shuko with some pretty decent stats in it, but I put a flawless amethyst in it to gain back some of the life/hit from my previous shuko. Is it worth removing the flawless amethyst to add a regular ruby (I don't have a flawless ruby).

My 33 monk was at around 450 damage at 33, I was built pure defensive...dodge tanking and didnt have a problem

I'm now 44 and still dodge tanking NM without issues. In act 3 now and actually got a 103 monster kill combo. I basically build like I would my DK in wow. Dex/vitality on everything. Aim for damage rings/amulet, high damage daggers with vitality/AS/On hit life and a socket and put in on hit life in the socket. NM is really easy mode at the moment for me